Claude file uploads failed for many users on April 20, 2026
The crowd signal moved around a file-upload incident that affected Claude.ai and Claude API uploads before resolving later the same hour.
Published: Apr 20, 2026, 9:31 AM EDT
Updated: Apr 21, 2026, 8:40 AM EDT
Incident started: Apr 20, 2026, 9:31 AM EDT
Crowd spike noticed: Apr 20, 2026, 9:31 AM EDT
Resolved: Apr 20, 2026, 10:21 AM EDT
Affected surface: Claude.ai uploads and Claude API file uploads
Official incident updates described elevated errors for uploading files and later marked the incident resolved after upload success rates returned to normal.
- Users reported upload attempts failing rather than a full Claude outage.
- The issue appeared narrower than a broad login or inference failure.
- A short spike in reports matched the official incident timing before settling back down.
A reviewed note on the April 20, 2026 Claude incident that produced elevated file upload errors and a visible crowd-report spike.
Review the methodology page for how crowd reports are deduplicated and the status lag explainer for how independent reports differ from provider updates.
If you want the broader archive context, go back to the Claude outage history page.
Related notes in the same incident category: